Book/Report

FZJ-2020-00784

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Bestimmung von absoluten Werten für Kinken- und Stufenenergien aus der Gleichgewichtsform von Inseln

Steimer, J. C. (Corresponding author)FZJ*

2001
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/24142

Report No.: Juel-3862

Abstract: The equilibrium shape of adatom and vacancy islands on Cu(100), Cu(111) and Ag(111)surfaces is investigated by scanning tunneling microscopy in the temperature range between290 - 450 K. From the equilibrium shape the relative free step energies are determined, makinguse of the inverse Wulff-construction. To obtain absolute values for kink and step energies,the Ising-model is used, yielding reasonable results for the (111) surfaces, but failing forthe (100) surface. To overcome this shortcoming, two novel methods are derived and appliedto the data: First, from the minimum curvature of the nearly straight step sections of the islands,the kink energies are determined. Second, by analysing the temperature dependence ofthe aspect ratio of the islands, the absolute values of the step energies are derived. Theeseresults are compared to values of the step free energies, obtained from an analysis of islandshape fluctuations and data, provided by theoretical calculations. Except for the Isingdescriptionof the (100) surface, all results agree well, confirming the introduced methods todetermine kink and step energies to be appropriate. It is discussed, why the Ising-model isnot an adequate model for the analysis of kink and step energies for (100) surfaces of fcc-metals.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000 ; Retrocat)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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